双音叉型共振器を用いた高精度隙間制御可能な高感度力センサ(機械力学, 計測, 自動制御)

概要

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A novel force sensor that can provide high sensitivity with accurate gap control has been presented. It combines a double-ended tuning fork (DETF) resonator with a rigid beam. When the force to be measured is applied to the rigid beam, the resonant frequency of the tuning fork changes due to the change of the tension. The DETF-based sensor can detect the force as the amplitude change corresponding to the resonant frequency change. The performance of the sensor was theoretically and experimentally investigated. The sensor can measure the force under the condition that the change of the probe-sample gap is less than 1nm. The experimentally attained minimum detection limit of the force was 19.6μN and this can be improved by two orders of magnitude according to theoretical estimation. The DETF-based force sensor can be useful tool for various field such as development of micro/nano-machine, micro/nano-tribology, probe microscopy.
2006-01-25